If you come across a large obstruction in the wall, like a mixer tap outlet, you’ll need to cut space in your tiles to accommodate it. Line your tile sheet up next the outlet and mark it’s position and size on your tile sheet.
Using the spirit level, transfer your marks into the correct position on the tile sheet and mark them up with your pencil. Then use the angle grinder to cut a hole in the tiles. Make sure that you wear your safety gear.